separate Gemfiles for different versions of rails

.gitignore

@@ -6,3 +6,4 @@ doc
 vendor
 .bundle
 Gemfile.lock
+Gemfile

Gemfile-3-0-stable

@@ -0,0 +1,6 @@
+instance_eval(File.read("./Gemfile-base"))
+
+gem "rails", :git => "https://github.com/rails/rails.git", :branch => "3-0-stable"
+gem "arel",  :git => "https://github.com/rails/arel.git"
+gem "rack",  :git => "git://github.com/rack/rack.git"
+

Gemfile-3.0.0

@@ -0,0 +1,3 @@
+instance_eval(File.read("./Gemfile-base"))
+
+gem "rails", "3.0.0"

Gemfile-3.0.3

@@ -0,0 +1,3 @@
+instance_eval(File.read("./Gemfile-base"))
+
+gem "rails", "3.0.3"

Gemfile → Gemfile-base

@@ -1,6 +1,6 @@
 source "http://rubygems.org"
 
-%w[rspec rspec-core rspec-expectations rspec-mocks].each do |lib|
+%w[rspec rspec-core rspec-expectations rspec-mocks rspec-rails].each do |lib|
   library_path = File.expand_path("../../#{lib}", __FILE__)
   if File.exist?(library_path)
     gem lib, :path => library_path
@@ -9,8 +9,7 @@ source "http://rubygems.org"
   end
 end
 
-gem "arel", :path => "~/projects/ruby/arel"
-
+gem 'sqlite3-ruby', :require => 'sqlite3'
 gem "rake", "0.8.7"
 gem "cucumber", "0.10.0"
 gem "aruba", "0.2.2"
@@ -19,6 +18,7 @@ gem "relish", "0.2.0"
 gem "guard-rspec", "0.1.9"
 gem "growl", "1.0.3"
 gem "ZenTest", "~> 4.4.2"
+gem "webrat", "0.7.2"
 
 if RUBY_PLATFORM =~ /darwin/
   gem "autotest-fsevent", "~> 0.2.4"
@@ -36,9 +36,3 @@ end
 platforms :jruby do
   gem "jruby-openssl"
 end
-
-#### rspec-rails only
-gem "rails", :path => File.expand_path("../vendor/rails", __FILE__)
-gem "rack", :git => "git://github.com/rack/rack.git"
-gem 'webrat', "0.7.2"
-gem 'sqlite3-ruby', :require => 'sqlite3'

Gemfile-master

@@ -0,0 +1,5 @@
+instance_eval(File.read("./Gemfile-base"))
+
+gem "rails", :git => "https://github.com/rails/rails.git"
+gem "arel",  :git => "https://github.com/rails/arel.git"
+gem "rack",  :git => "https://github.com/rack/rack.git"

Rakefile

@@ -1,10 +1,12 @@
-unless File.directory?("vendor/rails")
+unless File.exist?('./Gemfile')
   raise <<-MESSAGE
-You need to clone the rails git repository into ./vendor before you can use any
-of the rake tasks.
-
-    git clone git://github.com/rails/rails.git vendor/rails
+Could not find a Gemfile. Please run any of:
+  thor rails:use 3-0-stable
+  thor rails:use master
+  thor rails:use 3.0.0
+  thor rails:use 3.0.3
 
+And then run 'bundle install'
 MESSAGE
 end
 require "bundler"
@@ -54,8 +56,8 @@ namespace :generate do
   task :app do |t|
     unless File.directory?('./tmp/example_app')
       sh "bundle exec rails new ./tmp/example_app"
-      sh "cp ./templates/Gemfile ./tmp/example_app/"
-      sh "cp ./specs.watchr ./tmp/example_app/"
+      sh "cp ./templates/Gemfile-base ./tmp/example_app/"
+      sh "cp ./Gemfile ./tmp/example_app/"
     end
   end
 

Thorfile

@@ -15,4 +15,10 @@ class Rails < Thor
       `git fetch`
     end
   end
+
+  desc "use VERSION", "copies the appropriate Gemfile to Gemfile"
+  def use(version)
+    `cp ./Gemfile-#{version} ./Gemfile` 
+    `rm ./Gemfile.lock`
+  end
 end

templates/Gemfile-base

@@ -0,0 +1,17 @@
+source 'http://rubygems.org'
+
+group :development, :test do
+  %w[rspec rspec-core rspec-expectations rspec-mocks rspec-rails].each do |lib|
+    library_path = File.expand_path("../../../../#{lib}", __FILE__)
+    if File.exist?(library_path)
+      gem lib, :path => library_path
+    else
+      gem lib
+    end
+  end
+  gem "rcov"
+  gem "webrat", "0.7.2"
+  gem "ZenTest", "4.4.2"
+end
+
+gem 'sqlite3-ruby', :require => 'sqlite3'